Non-REM parasomnias have variable prevalence rates depending on patient age and comorbid diagnoses. Sleep talking, bruxism, sleepwalking, sleep terrors, and enures-
is occur more frequently in childhood than in adulthood. Nightmares appear to occur with similar frequency in adults and children. REM behavior disorder (RBD), an REM-sleep parasomnia, has a reported prevalence of 0.5% and frequently is associated with concomitant neurologic conditions.16 Chronic RBD is more common in elderly men and may have a familial disposition.
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